Video thumbnails are not created

[Danilo]

When uploading a video, no thumbnail is created.

Celery output (debug mode):

2013-06-11 16:54:11,706 INFO    [celery] Got task from broker: mediagoblin.processing.task.ProcessMedia[c78040c7-7c09-4ab8-a4e0-01e4088dfaf7]
2013-06-11 16:55:05,639 WARNING [celery] /var/www/mediagoblin/VIRTUAL/local/lib/python2.7/site-packages/SQLAlchemy-0.8.1-py2.7-linux-x86_64.egg/sqlalchemy/engine/default.py:471: SAWarning: Unicode type received non-unicode bind param value.
  processors[key](compiled_params[key])
2013-06-11 16:55:05,826 WARNING [celery] /var/www/mediagoblin/mediagoblin/media_types/video/transcoders.py:237: DeprecationWarning: integer argument expected, got float
  0)
2013-06-11 16:55:06,157 INFO    [celery] Task mediagoblin.processing.task.ProcessMedia[c78040c7-7c09-4ab8-a4e0-01e4088dfaf7] succeeded in 54.4011001587s: None

I'm using current master (25aad338d4921ec76484c6d2af5e40c97904917d).

[ayleph]

This issue is light on details and doesn't provide enough information to debug. The two warnings are generic and shouldn't cause thumbnail creation to fail. In fact, I see these errors quite often when thumbnails are generated successfully.

I believe this may be the same issue that was later brought up in #790 [1]. I'm going to mark this ticket as a duplicate.

[1] https://issues.mediagoblin.org/ticket/790

[ayleph]

For a description/resolution to the DeprecationWarning: integer argument expected, got float warning, see ticket #932.